Pittsburgh Coal  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Pennsylvanian
 .....Pittsburgh Coal
RTOhio
 Pennsylvania
 West Virginia
 Monongahela Group
SNAdded to Thesaurus in 1989.
Pittsburgh coal basin  search
BTUnited States
 .Pennsylvania
 ..Pittsburgh coal basin
RTcoal fields
SNBituminous coal and steel producing region in the Pittsburgh area.